Nodejs High CPU usage

Question

I am trying to determine why my nodejs server has extremely high CPU usage. When running top, I can see that the CPU usage for node can hit up to 60% with a single user. I used node-tick to profile my application, but I cannot seem to understand the results well enough to find the source of the problem.

I am using:

socket.io
mongodb
jade-templating
express

Here are the results:

 [Shared libraries]:
   ticks  total  nonlib   name 
  31273   88.5%    0.0%  b77b7000-b77b8000
   2144    6.1%    0.0%  /usr/local/bin/node
    269    0.8%    0.0%  /lib/i386-linux-gnu/libc-2.15.so
     45    0.1%    0.0%  /lib/i386-linux-gnu/libpthread-2.15.so
     13    0.0%    0.0%  2cd46000-2cd47000
     11    0.0%    0.0%  /usr/lib/i386-linux-gnu/libstdc++.so.6.0.16
      2    0.0%    0.0%  /lib/i386-linux-gnu/librt-2.15.so

I cannot seem to find this "b77b7000-b77b8000" and google is not yielding many results.

Can anyone determine what is causing my node.js to use so much CPU time?

Answer 1

Yo can use a profiler to inspect performance of stack function by function.In my option Chrome's is the best one. Here is a tutorial about how to use it with nodejs

Once you connected debug console to your Chrome debugger you can use performance tab to record a profile for inspection